featured Diesel Heater E03 Fault Code: Undervoltage — Diagnosis and Fix
E03 (blink code 00011) means supply voltage has been too low for at least 20 seconds. Limits: above 10V on 12V systems; above 21V (air) / 20V (coolant) on 24V systems. Check battery, fuses, wiring voltage drop and the charging system.
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